amnesia
https://gyazo.com/fce31e4daf2e516bd48cc50b9099eab8
source: Fair use
noun
a partial or total loss of memory:
〘医〙 記憶喪失(症), 健忘症
e.g. they were suffering from amnesia.
DERIVATIVES
amnestic |amˈnestik| adjective
ORIGIN
late 18th century: from Greek amnēsia ‘forgetfulness’.